Summer corn sowing technique

The summer harvest is approaching, in order to timely plant a good planting type of summer corn, lay a good foundation for sowing, ensure that all seedlings will be sowed and autumn crops will be harvested. Summer corn sowing management techniques are as follows:
1. Choose good breeds. Suitable for the cultivation of the county's fine varieties, mainly Zhengdan 958, Yandan 20, Chifeng 2, Denghai 9, Xianyu 335, Daiyu 16, and so on.
2. Seed treatment. (1) Sowing before sowing: not only can promote the later maturity of seeds, enhance the water absorption of seeds, increase the germination rate and germination potential, and increase the seedlings for 1-2 days in advance, but also can kill the pathogenic bacteria in seeds. (2) Chemical seed dressing: using fungicides or insecticides for seed dressing, mixing and drying before planting; for mixed plots of underground pests and maize diseases, mixed pesticides can be used for seed dressing and mixed pesticide dressing At the time, pay attention to the insecticide first, then dry it and mix the fungicide. Underground pests, can use 50% of phoxim EC 80 ml, water dressing amount of 100 kg, mix and dry after drying; Root rot, smut, available 50% carbendazim EC 200 ml, watered Appropriate amount, dressing 50 kg; can also choose to harvest 50 ml jade, coated seeds 5-7.5 kg.
3. Scientific sowing. “In the spring and summer competition, timely timely sowing can increase effective accumulated temperature and make full use of fertilizer, water, light and heat resources. It is an important measure to ensure the high yield, stable production and high quality of summer corn. It should be sown before June 20th. Finish. The sowing volume is generally controlled at 2-3 kg/mu to ensure the seedlings are strong; the sowing depth is controlled at 3-5 cm, sowing the seedlings is too deep and weak, and the seedlings are not easy to emerge; when sowing, apply a certain amount of seed fertilizers. It can not only promote the growth of seedlings, but also prevent and control the occurrence of diseases. For example, if 7.5 kg of potassium carbonate is applied per acre during sowing, corn stem rot can be effectively controlled.
4. Watering in time. Before the sowing or after sowing of corn, it should be watered in time to supplement the soil moisture to ensure that the seeds have sufficient moisture, and then normal germination and emergence, especially the watering of the land with the fertilizer is more timely.
5. Appropriate time seedlings, Dingmiao. After corn emergence, 3-4 leaves of corn should be used for thinning, 6-7 leaves when Dingmiao, to avoid seedling crowding, competing with each other, compete for water, win light, pull out weak seedlings, diseased seedlings, self-injected seedlings, mu stay The number of seedlings should be flexibly controlled according to the variety, and the seedlings should be seeded at the density required by the cultivar. Such as Zhengdan 958, should be dense planting, about 4,000 acres of plants; Xianyu 335 suitable for sparse planting, about 3200 acres left. The timing of seedlings is controlled at 4 pm on sunny days, and the weak seedlings of the pests are susceptible to wilting after sun exposure, which is easy to identify and difficult to pull off.
6. Chemical weeding. Efficient and low-residue, no-side-effect sprays are used. Mastering uniform spraying on the ground in three days after sowing, the effect is good. Use 40% EtOH mixture 200-250 ml per acre and dilute 50 kg to evenly spray the ground; or use 50% Dua Mixture 150 ml/drinking water 50 kg/mu before the 4 leaves of corn, evenly spray ; Or in the corn 7-8 leaves, with 20% of paraquat 300 times, in the spray nozzle plus protective cover directional spray, except for the treatment of older weeds.
7. Control seedling pests and diseases. (1) Laodelphax striatellus and aphids are corn-borne insects, and are sprayed with 40% phoxim EC or 1000 times metapyr EC. Insect pests such as borers, pneumocystis, thrips, swans, and ground tigers, 30 ml of 30% ectoine EC for mu, 15 kg of water for spraying or 1000-1500 times spray of 40% phoxim EC. (2) Prevention and cure of corn virus disease in the one-leaf period of corn, mu 20% virus A WP 500 times, continuous spraying 3 times; also available 1.5% Zhilingling II 800-1000 times liquid, every 7 - Spray once every 10 days, spray twice, and evenly spray both sides of the blade.

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